Note ׳¿½€“1.0, 1.5 & 2 HP Dragon Pumps have 2-1/2׳¿½€׳¿½ unions for IN and OUT. A 2.5׳¿½€׳¿½ pipe will give you higher pressure but will slightly decrease the flow. Increasing the pipe to 3׳¿½€׳¿½ will provide 100% max flow. This will not over amp the motor and will match the performance curve ׳¿½€“ shown.